Emptying device and method



' l May23, v1939. l v E. R ALUNG ,2,159,000

lEMP'IYING DEVICE AND METHOD ATTORNEYS May 23, 1939- l E. R. ALLING 2,159,000

lEMP'IYING DEVICE AND METHOD Filed Nov. `2e, 1957 11 sheets-sheet 2 ATTORNEYS AMay z3, 1939.

E. R. ALLING EMPTYING DEvIcE AND METHOD Filed Nov. 2G, 1937 11 Sheets-Sheet 3 ATTORNEYS May 23, v1939. E. R. ALLING d 2,159,000

EMPTYING DEVICE AND METHOD Filed NOV. 26, 1937I 11 Sheets-Sheet 4 ATTORNEYS El R. ALLING EMPTYING DEVICE AND METHOD May 23, 1939.

Filed Nov. 26, 1937 11 Sheets-Sheet 5` jfl/49.12.

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ATTORNEYS INVENTpR May y23, 1939. E. R. ALLING EIPTYING DEVISE AND METHOD Filed NOV. 26, 1937 11 Sheets-Sheet 6 Itri lNvErg-ron A'rroRNEYs May 23, 1939*. E. R. ALLING 2,159,000

nuP'rYING nnvlcr: AND M'raov Filed Nov. 26, 1957 11 Sheets-Sheet 7 Zig. 16:

l lNvErroR WQ, @M 0 ma ATTO R N EYS May 23, 1939. E. R. A LLING .72,159,000

EMPTYING DEVIGE AND METHOD Filed Nov. 26, 1937' v 11 Sheets-Sheet 8 INVENTOR ATToRNl-:Ys

May 2,3, 1939. E. R. ALLING l `2,159,000

EHPIYING DEVICE AND METHOD Filed Nov. 26, 1937 l1 Sheets-Sheet 9 ATTORNEYS May 23, A1939. v E. R. ALLING 2,159,000

EMPTYING DEVIGE AND METHOD Filed Nov. 2e, 1957 11 sheets-sheet 1o ffy/2 Z INVEINTOR 7.97 1,- V99' AE12 7 A. l D/ewwfm@ Z9 ATTORNEYS May 23, l939 E. R. ALLING EMPTYING DEVICE AND METHOD NNYNN INVENTOYR i Patented lMay 23,l 19Zl9 UNITED STATES PATENT OFFICE "T` Application 1.31, No. 116,158 scum. (cazzi-m I'his invention vrelates to the emptying of containers while said containers are supported in approximately upright positions.. and is particularly valuable in the emptying of milk from cans. In the dairy industry, for example, the fluid milk is carried to assembly points or dairy plants in .large metal cans and there the cans' are emptied.

and their contents weighed vand sampled. Such" cans have been commonly emptied by inverting them over a tank, and, unless the cans have previously-been washed, considerable dirt on the exterior of the cans is likely to fall into the tank with the milk and contaminate it. The cans are difficult to wash and sterilize exteriorly, when illled, for the reason that the relatively cold milk in the cans prevents heat sterilization of the cans.

f -The cans are diillcult to dry when filled with relatively cold milk, andthe inverting of said cans is apt to cause some of the moisture on 80 the exterior of the .cans-to fall-in the tank 'with the milk and contaminate and dilute the same.

An object of this invention is to provide imf proved means bywhich any-containers orV cans may be rapidly emptied while in ullrlht positions, with .maximum of cleanliness and: freedom from contamination of the can or container, and .with which contents remaining after an emptying voperation will bea minimum.

Another object is to provide improved mns ,30 for accomplishing this purpose,fwitl1 which the contents will be protected largely from air contamination during the emptying, with which loss through drip from the emptying conduits will be a minimum, and which will be relatively simple 35 and inexpensive.

Another object of the invention is to provide an improved means for emptying upright containers -1 'while they remain upright with maximum rapidity and completeness, and in a simple and inex- 4 pensive manner.

Another object of the invention is to provide an improved system for emptying milk cans and theA like, cleansing them, and' delivering them in upright positions, such as a continuous operation, and which will be relatively simple, emcient and inexpensive, and require a minimum oi manual labor and attention.

Another object of the invention is to provide 50 an improved method for emptying upright containers while they remain upright, by applying an emptying iluid to the containers and establishingpressure differences on the contents to be removed, with which a minimum consumption of u actuating iluld will be necessary, and which will Iii' be .equally effective on containers of different helhts.

Other objects and advantages will be apparent trom the following description of two embodiments of the invention, and the novel features 5 willbe particularly pointed out hereinafter in connection with the appended claims.

' AIn the accompanying drawings:

Pig. 1 is a front elevation of a hydraulically controlled apparatus for emptying containers, such as the milk cans used in the dairy industry, in accordance with this invention Fig. 2 is an end elevation of the same; Fig. 8-is a sectiolrvialplan through a portion of the same.' to illustrate the dripl savingfeature 15 thereof. the section 'being taken 'approximately -alongtheline 3-3ofFlg.1;

Fig. 4 is a sectional elevation through a portion of the same drip saving features, the section being taken approximately alongv the line 4--4 of 5 is a rear elevation of the apparatus;

6 is a sectional elevation through another on of the drip saving mechanism, the sec- -being taken approximatelyl along the line of Fig. 3;

'I a sectional plan through the mechashown in Fig. 6, the section being taken approximately along the line 1--1 of Fig. 6; l

Fig. 8 is a sectional plan through the apparatus, the section being taken approximately along 'the line I-S of Fig.1;

Fig. 9' is a sectional elevation through the can feeding mechanism of the same, the section being taken approximately along the line 9 9 of Fig. 8;`

Pig. 10 is a sectional elevation through a portion of the same. the section being taken approximately along the line IB-Ill of Fig. 9;

Hg. 11 is a sectional elevation through another portion of the can feeding mechanism, the section being taken approximately along the line`II- ii of Fig. 9:

Fig. 12 is a sectional elevation through the emptying mechanism at the start of the removal of milk from a can, the section being taken approximately along the line I2-l2 of Fig. 2;

Pig. 13 isa sectional plan through the same, the section beingtaken approximately along the line Il-Il of Fig. l2; .l

Pig. 14 is another sectional plan through the same, thesection being taken approximately along the line II--H of F18. l2; l

Pig. 15 is another similar sectional elevation of the emptylngmechanism.' similar to Fig. 12, but at the completion of theremoval of' milk from ..55

the can, the section being taken approximately along the line I5-I5 of Fig. 12;

Fig. 16 is a sectional plan through the same at the stopper or sealing head, the section being taken approximately along the line I6-I6 of Fig. 12;

Fig. 17 is another sectional plan of the same, the section being taken approximately along the line I1-I'I of Fig. 15; v

Fig. 18 is a schematic diagram of the mechanism shown in Figs. 1 to 1'7 and of the connections and controls forming a part thereof, by which the principle and mode of operation of` the invention may be more easily explained;

Fig. 19 is a front elevation of a can emptying mechanism also constructed in accordance with the invention, and illustrating a modification of the same;

line 23-23 of Fig. 22; and

Fig. 24 is an elevation, partly in section, of a system in which the emptying mechanism may be a part, and by which the cans lled with milk may be emptied While in upright position, inverted, cleansed and dried, again up-ended into'upright positions, the covers replaced, and the can and positions.

" In the embodiment of the invention illustrated in Figs. 1 to 18 inclusive, the apparatus is mounted in a suitable frame I having columns or posts 2 upstanding therefrom. A pair of guide rods or bars 3 are supported in upright position by a cross bar 4 (Figs. 1 and 5) connecting the upper ends of the posts 2, and to which the upper ends of the guide rods are secured. The lower ends of the guide rods are connected to the frame in any suitable manner. A cross head or block 5 (Figs. 1,' 5 and 18) is mounted to slide vertically on the guide rods 3, and springs 6' on the upper ends of the guide rods 3 resist any tendency of the cross head 5 to overrun at its upper limit of movement. An

operating rod 'I (Figs. 5, 15 and 18) depends from the cross head or block 5 and extends into a ram cylinder 8 where it terminates in a piston 9 that reciprocates endwise in the cylinder 8. Thus by varying the effective pressures on opposite faces of the piston 9, the elevation and lowering of cross head 5 may be caused. The mechanism for producing diiferent effective pressures on the opposite face of the piston 9 will be explained hereinafter.

Mounted upon the cross head 5 is a spout or pipe I6 (Figs. 1, 2, 5 and 15). This spout I0 is disposed in an inclined position, and at its upper end it is connected through a collecting head II to the upper end of an upright pipe or conduit I2. The pipe I2, head I I and spout or pipe I together form an emptying conduit with the pipe I2 constituting a depending vertical leg or conduit, and the spout or pipe IIJ a laterally extending section thereof. The lower end of the pipe I0 is disposed to discharge the contents of the containers into any suitable receptacle, which in the milk industry will usually be a weigh tankin which the milk or contents of the containers may be weighed and sampled. The pipe or conduit I2, intermediate of its ends, is provided with`an external peripheral ange I3.

A sleeve I4 (Figs. 12v and 15) is slldingly conned on the lower end of the pipe or conduit I2, so as to have limited endwise movement thereon, and through gravity this sleeve I4 will normally descend to its lowermost extent, and if it engages the bottom of a container before the tube I2 has been lowered by the cross head to the full extent. the sleeve I4 may remain in contact with the bottom of the container and the remainder of the conduit I2 will be free to descend further to a limited extent. A tube or pipe I5 (Figs. 12 and is disposedwithin the conduit or pipe I2, so as to extend from end to end thereof and upwardly into the collecting head Il. Extending downwardly through the removable top I6 of the collecting head Il is an operating rod I1, and the lower end of this rod I1 is removably connected, such as by a pin I8, to a fin I9 that extends across the open upper end of the pipe or tube I5. The upper end of the rod II is connected to the diaphragm of an air motor 2I.

The rod I1 is guided through the top I6 of the collecting head I I by means of a tube 22 which is secured in the top I6 so as to extend upwardly therefrom along the rod Il for some distance, and

this tube or pipe 22 carries an adjustablenut 23 thereon which, with a Washer 24 resting thereon, acts as one. abutment for a helical coil spring 25, the other end of which spring abuts against the lower face of the diaphragm 20 of theA air motor 2|. Thus the spring 25 normally forces the diaphragm 20 upwardly, but when fluid pressure is exerted on the diaphragm, the diaphragm and the rod I1 will be forced downwardly into the collecting head II, and by reason of the connection to the tube I5 the latter will be shifted endwise in the pipe or conduit I2 to a limited extent.

Slidably mounted on the lower end of the tube I5 is a sleeve 26, which forms a telescopic extension of the lower end of the pipe I5, and this sleeve 26 is connected by one or more hns 21 (Figs. 15, 16 and 17) rigidly to the sleeve I4 so that the sleeves 26 and I4 together form a rigid unit which is telescopically connected to the lower end of the pipe I2 and also the lower end of the tube or pipe I5. The sleeve I4 forms a continuation of the lower end of the pipe I2, and the sleeve 26 forms a similar extension for the pipe I5.' It'will be noted that the sleeve 26 extends at its open lower end slightly below the open lower end of the sleeve I4 for a reason which will appear hereinafter.

The ns 21 extend slightly below the lower end of the sleeve 26, so that by engaging with the bottom of the container the lower end of the sleeve 26 will be just slightly spaced above the bottom of the container, and thus the contents of the container may pass into the sleeve 26 through the open lower end thereof, even though the sleeve 26 may be resting through the ns 21 directly upon the bottom of the container.

'I'he collecting head Il as a chamber 28 (Figs. l2, 14 and 15) therein which opens into the pipe or spout I0 and the pipe I2 opens upwardly through the bottomof this chamber. A sleeve 29 telescopes slidinglywithin the passage through the bottom of the collecting head I I which forms the connection to the pipe I2, so. that the sleeve 29 forms a telescopic extension of the passage of the pipe I2. Fins 30 (Figs. 12 and 14) connect 'the sleeve 29 to the tube I5,,-so that the sleeve 29 moves vertically with the tube l5 to an extent permitted by its telescopic travel in the collecting head II. vA deflector head 3| (Figs. 12 and 13) is disposed in the upper part of the chamber 28 of the collecting head, and lis supported rig-` llo the'periphery of the deilector head 3I toa ring 33 which is conned in a recess in the upper edge' of the collecting head by the removable top plate I6. 'I'his deiector head 3| is provided 4with a passage 34'through which the rod I1 passes loosely, and the lower end of -this passage 34 telescopingly and slidably receives the'upper end of the tube I5. The tube I is thus guided for vertical "movement at its upper end by the deflector head 'withstanding that the tube I5 may* have been shifted endwise to some extent by the diaphragm 28 or' spring 25. The upper end of the sleeve 23 engages or seats against the under face of the d eilector head 3 I when the tube I5 is shifted upwardly bythe diaphragm 26 and spring 25 (as shown clearly in Fig. and when in thatpo- .sition it closes communication between the passage of the pipe I2 and the chamber 28 of the collecting or valve head AI I. When the tube I5 is lowered, such as into the position shown in Flg. 12, the sleeve '23 will descend away from the deiflcctor head 3| and thus establish communication between the passage or pipe VI2 and the chamjb'er26. The sleeve 29 is',` therefore, a shiftable valve element which controls the passage through the pipe I2, outside of the tube I5, and

maybe closed or opened merely by shifting the' resilient downwardly tapered sealing 'gasket 36 which is engageable in the upper open mouth'of the containers. A helical compression spring 31 is provided on the conduit or pipe I2 and abuts at one end upon a ange 38 on the lower end of the collector head |I wherethe pipe I2 screws into the same. 'I'he other enti of the spring 31 engages with the upperend of the stopper or head 35, so as to "urge the latter downwardly.Y

` roller axles'56 (Figs. 1, 2, 9 and 11), and the lat- Normally, the spring 31 urges the stopper 35 against the flange` I3 on the pipe I2 (as shown in Fig. `1) but when the conduit pipe I2 is lowered into a container (as shown in Fig. 12) the stopper 35, when it engages with the mouth of the container, will be held against further downward movement while the pipe I2 continues t descend to the bottom of the container, during which action the spring 31 is further compressed.,

Thebody of the stopper 35'extends below the sealing gasket 36 and terminates in a shoulder 39 which abuts against the ilange I3 when the con- .stopper engages against the aange la, the noulder 33 will abut the ange I3 and the latter will close the passages 4| at their lower ends. A pipe or tube 42 (Fig. 12) is connected to the stopper 35l so as to communicate with the chamber 40 and supply thereto an actuating iluid under pressure, such as compressed air. Another tube 43, (Fig. ,12) is also connected'to the head 35 at a distance -from the tube 42, and the head is provided with a passage 44 (Figs. 12 and 16) which leads from the connection to the tube 43 and opens downwardly through a shoulder 33a in a different plane than the shoulder 33, so that the passage 44 extends from face to face of the stopper or sealing head 35, and is separate from the chamber 46 and passage". When the stopper or sealing head 35 abuts against the flange I3 on the pipe I2, the lower end of passage 44 will be free of any pressure in chamber 40.

The receptacles or cans 45 are fed by any suitable means in a prescribed path in succession beneath-the depending conduit or pipe I2, and,

the pipes I6 and I2 with the collecting head Ii,

either are lowered to disposed pipe I2 in the cans in succession to perform an emptying operation,

, and then velevated out of the cans through actuation of the rod 1 and cross head 5, or the cans are elevated over the pipes I6 and I2 and then lowered at the conclusion of the emptying operation. In the illustrated example, the pipes Ill and I2 are lowered into the cans, but it will be understood that the movement is a relative one. One example of means for feeding the ycans beneath the depending pipe I2 will now be described. On the frame I, I provide-a guide or trackway formed of'parallel angle strips 4,6 (Figs. 1, 2, 5, 8, 10, 11, 12 and 15') which are spaced apart, and the horizontal legs or arms of these angle strips, which extend towards one another in approximately the same plane, together form the supporting surface along which the rcans 45 may be slid. The.upstanding arms or legs of the angles confine the cans against lateral displacement while permitting movement along the angies.

A channel bar 41 may also be disposed between the angles 46, with its upper edge or face in the same plane as the horizontal arms of the angle f strips 45, so as to form a support for the cans in between the angle strips and prevent the cans from tipping during the feeding operation. Dog bars 48, which valso may be angle bars, are disposed in the spaces between the channel strip 41 e and angle strips 46, so as to extend' parallel with the same but slightly below the common surface of the strips 46 and 41 on which the cans slide. These dog bars 48 ride upon flanged wheels 49 of ter are arranged to roll upon supports 5I provided on suitable parts of the frame I (Fig. 11) The ends of the supports 5I are upstanding or bent upwardly to limit the rolling travel of the axles 50. Each dog bar has pivoted thereto a plurality of spaced dogs 52, and these dogs have corresponding ends weighted so as to yieldingly project the other ends upwardly above the sliding surface on which the cans are supported, as shown for example in Fig. 1.

The dogs 52, at their weighted ends, rest upon v the horizontal flanges of the dog bars to limit i the maximum extent that their free ends are* projected upwardly into driving engagement with the cans, andl yet when the dog bars are moved".

which they lift the weighted ends.' As 'soon they clear the cans, the dogs will again automatically assume the upwardly projecting, driving positions shown in Fig. '1, for example. The dogs 52 are spaced apart along the dog bars a distance corresponding to the desired spacing ofthe cans on the trackway or guideway. The dog bars are connected together aty intervals along their length by strips 53, so that the dog bars together form a reciprocating, can feeding unit.

At one end the dog bars are also connected by a bar 54 (Fig. l0), an arm 55 depends Afrom this bar near one end of the frame I. This depending arm -55 (Figs. 9 and 10) is provided with a vertically elongated slot 56, and a bearing block l5 51 is reciprocatingly confined in the slot 56.

Rotatably mounted in the frame I is a shaft 58, and this shaft 58 mounts thereon a gear 59 and a crank arm 60. 'I'he arm 60 is connected by a pivot pin 6| to the sliding block 51 in the o slot 56. When the arm 60 is approximately horizontal, the sliding block 51 is, approximately at the lower end of the slot 56 (as shown in Fig. 9) and when the shaft 58 is rotated through a half revolution into the position shown by dotted 5lines in Fig. 9, it will shift the depending arm 55 from the full to the dotted line position in Fig. 9. Because of the fact that crank arm 60 is approximately at the dead center at its limits 'of movement, the starting and stopping of the dog bars as they are moved through the depending arm 55 will be easy and gradual, but with relatively rapid travel in between the limits of movement, which reduces the tendency to slop by any liquids in the cans. The gear 59 meshes with and is driven by a rack bar 62 which forms an extension of one end of the piston of a ram 63, mounted in a horizontal position in the frame When fluid pressure is supplied to the ram 83 it Will force the rack bar 62 to the right in Fig. 9, and thus cause a. shifting of the crank arm 60 from the full to the dotted line position, and consequently a movement of the dog bars 48 through a distance slightly greater than the desired spacing between the cans, that isa distance slightly greater than the spacing between the dogs 52 along the dog bars. A chain or cable 64 running over a guide pulley 65 is connectedat one end, as at 66, to the rack bar 62 (Fig. 9) and at its other end to a Weight 61. When the rack bar 62 is moved in one direction by the ram 63, it elevates the weight 61 and then when the actuating iluid is released from the ram theweight 61 returns the rack 62 and through it the dog bars and dogs to-their initial positions shown in full 55 lines in Figs.,8 and 9.

. The ram A6l! is supplied with actuating fluid through a pipe 68 (Figs. 9 and 18) and the pipe 68 extends to a hydraulic, controlling valve 69 of well known and common construction. VA pipe 60 10 leads from the valve 69 to a reservoir or sump 1| for the hydraulic actuating liquid, and a pipe 12 leads from the valve 69 to the output side of the pump 13 which is preferably of the variable delivery type that sets itself to approximately 65 no delivery when a selected pressure is encountered in the output side of the pump. The valve 69 is provided withv a valvel element 14, having a cam roller 15 on its outer end which rides upon a cam 16 mounted for rotation with a shaft 11.

70 The cam 16 will thus cam the valve element 14 into the valve 69 intermittently and in doing so will connect the pipes 10 and 12 alternately with the pipe 68. When the pipe 12 is connected to the pipe 68 through the valve 69, the hydraulic 75 iiuid from the pump 13 will be delivered to the l ram 63 and cause a forward movement of the dog bars.

When the pipe 18 is connected to the pipe 68 through the valve 68, the ram 63 will be connected to exhaust so that the operating liquid 5 previously delivered may escape back to the reservoir 1|. 'Ihe intake side of the pump 13 is connected by a pipe 18 to the reservoir 1I. Pumps of the variable delivery type are well known in the hydraulic art, also the type of valve 69 which is illustrated only diagrammatically. They are articles available in the open market; and therefore a detailed description has been omitted. The shaft 11 is driven through a. speed reduction gearing 19 from a motor 88 which is supplied with current through line wires 8| controlled by switch 82. The pipe 12 may preferably have ametering control valve 83 in series therein, by which the rate of advancement of the dog bars may be regulated through regulation-of the rate of delivery of actuating liquid to the ram 63.

The motor 88 i's of the constant speed type, such as a synchronous, alternating current motor of a type in common use. The line wires 8| also supply current to a motor 84 (Figs. 5, 8 and 18) which through a beit 85 drives the variable delivery pump 13. Since the motor 88 operates at a constant speed, and there is a definite driving connection to the cam 16, it follows that there will be reciprocations of the dog bars, and therefore intermittentv movements of the cans, at regular time intervals, and consequently the cans will be fed at regular time intervals in succession beneath the emptying pipe for a selected interval of time determined by the rate' of rotation of the cam 16.

Any suitable means may be employed for lowering the emptying pipe or conduit |2 into the cans and then elevating it therefrom in proper timed relation to the step b y step movements of the cans, and in Figs. 1 to 18 I have illustrated, by way of example, hydraulically actuated means for controlling the lowering and elevation of the emptying conduit or pipe l2. The rod 1 which is connected to and actuates the cross head 5 that carries the emptying pipe or conduit, as previously explained extends into a cylinder 8 of a hydraulic ram and terminates in a piston 8 within the cylinder 8. A pipe 86 connected to the upper 'end of the cylinder 8 supplies actuating liquid to one end of the cylinder 8, and a pipe 81 is connected to the other or lower end of the cylinder 8 to supply actuating liquid thereto. The pipe 86 extends through a needle valve 88 (Fig. 18) to a supply pipe 88 which leads to the output sideof the pump 13. The pipe 81 is connected through a metering valve 88 toa pipe 8| which leads to a controlling valve 92. The valve '82 is a well known controlling device `for hydraulic rams, is available in the open market, and its valve element 93 is actuated between its limits of movement by aL solenoid 84.

Connected in parallel across the needle valve 88 is a rapid traverse and check valve 85 known as a Vickers" valve and available in the open market under that name. Such valves have branch parallel passages 86 and 81 (Fig. 18) In the passage 86 is a check valve element which opens to pass liquid freely in the direction shown by the arrow in Fig. 18, and closes automatically to prevent reverse flow. Flow through the other passage 81 is controlled by a reciprocating valve element 98' having a cam roller 98 at its free end. and which is adapted to ride upon a cam lll 76 carried by the` cross head l. A spring within the housing of valve 95 normally urges the valve elev ment outwardly and into the path ofthe camm.

The valve 95 is so disposed that the roller 99 thereof will be engaged and operated in one direction by the cam |00, as the cross head Just about reaches its upper limit of movement (as shownin Fig. 18). When the roller 95 rides on the cam |00 (Fig. 18) it closes or restricts the passage 91 through the valve 95, and when the cam |00 releases the roller 99 the valve element 90 opens the passage 91.

Y on its outerv end, which is adapted to be engaged and operated by a cam .|09 also carried by the cross head 5. When the valve element |04 is forced inwardly by the cam 09 it restricts or shuts off communication in the passage |03. 'I'he valve 92 operates, when the valve element 93 thereof is in one position, to connect the outlet side of pump 13 and 'also' pipe 99 to the pipe 9|,- and when in its other position to connect the pipe 9| to a pipe |01 which leads to the pipe 10 that conveys'the actuating liquid back to the reservoir 1|. It will be noted that the pum'p 13 is connected at its outlet side at all timesl to the pipe 09, and thusthrough the pipe 99 leading to the upper end of the cylinder 3 it tends to force the piston 9 downwardly at all times. The pipe 9| is connected alternately to the outlet side of v pump 13 through pipe 99 and to the exhaust pipe |01. Because of the fact that the pipe 99 is connected totj the upper end of the cylinder 9, where the rod Uextends from the piston 9 exteriorly oi' the cylirilger 8, it follows that the total pressure area on, ducedfby the area occupied by the rod 1, so as to be considerably below the total pressureearea available on the under face of the piston 9. Therefore, even if the output side of the pump is connected at the vsame time to both ends of the cylinder 9, the piston 9 will be forced upwardly because the total pressure on the bottom of the piston vwill be gi'e'ater because the pressure area is greater and the pressure per unit area isl tlie same. When the pipe 9| is connected to the exhaust pipe |01, then the pressure onthe lower. face ofthe piston 9 will be released andthe pressure on the upper end of the piston 9 will force the piston downwardly and lower the cross head 5.

As previously explained, the valve element 93 is actuated by the solenoid or electromagnetic operating device 94, which, when operated, pulls outwardly on the valve element 93 and'serves to connect the pipe |01 to the pipe 9| and cause a downward actuation of the piston 9 and cross head 5. When the operating device 94 is deenergized, itautomatically shifts the valve element 93 into a position to connect the outlet side of the pump 13 through pipe 99 to pipe 9| and at the Asaune time to disconnect pipe 9| from the exhaust pipe |01, whereupon the piston 9 will be. forced upwardly to raise the cross head 5. Valves 92 of this type are common in the hydraulic art, and

have not been illustrated and described in detail 'since theyare available in the open market.

The j2| for the diaphragm 29 at the e upper vface o! the piston 9 will be retop of the emptying conduit is connected by a ilexible hose or pipe |08 (Figs. 1, 2, 15 and 18) to a valve or device |09 (Fig. 18), and this valve device is also connected by a pipe ||0 to a source of compressed air or other actuating iluid under 5 pressure; The pipe ||0'is alsoconnected through a pressure reducing device and pipe ||2 to the tube or pipe 42 leading to the stopper or sealing head 35. The pipe ||2 may include in its connection to the tube 4 2, a flexible hose ||3 10 which enables the head 35 to move upwardly and downwardly while remaining connected to the pipe ||2. The ltube 43 is connected by a pipe ||4 having ya flexible hose or section therein to f the air -motor 5 of a pressure responsive or 15 micro-switch ||6. -The air motor I5 is similar to the air motor 2| in Figs. 12 and 15, but is very sensitive to pressure fluctuations. When air or iluid under pressure is Supplied to the motor ||5 through the pipe ||4, it depresses the diaphragm 20 therein and closes the switch ||6. When the pressure on thediaphragm in the motor ||5 falls below that determined by the usual opposing or regulating spring therein, it is operative to open the switch ||9.

The valve |09 is operated between its two positions by an operating solendid ||1, and when in One position it connects the pipe ||0 to the ilexible hose |09, and when in its other position it interrupts this connection and vents the tube |08. 30 'Ihe solenoid ||1 is connected in series in line wires I8 and ||9 which are connected to the line wires 9| controlled by the switch 82', and the circuit between the line wires ||9 and 9 may be closed by the switch ||9. Thus, when the switch 35 ||6 is closed it completes a circuit through the solenoid ||1 and causes an actuation of the valve |09. Wires |20 and |2| are connected to the wires ||0 and.||9 respectively, in parallel across the switch ||6, and these wires |20 and 40 |2| lead to a normally open switch |22 which is normally urged into open position but operated to closed position through an interponent lever 22a which is actuated, during descent of the cross head 5, by a cam 23 on the cross head. 45

A, spring-|221) (Fig. 18) urges the interponent into the full line position shown in Fig. 18 from displacement in either direction of pivotal movement from that position.

The switch |22 and its operating cam |23 are 50 V'so positioned with respect to one another and to the cross head '5 that'the switch |22 will be open while the cross head 5 is in its elevated position and for some slight distance below the elevated position, after which it will be closed until .the sealing head` or stopper 35 has engaged the mouth of the container or can. Thus the switch |22 is connected in parallel to the switch I9, and each of them is operative to complete the circuit through the solenoid |1 and cause delivery 00 of compressed air to motor 2| and a lowering of vvalve element 29 to. open the main passage of conduit I2.

The wire 8 is'connectedby a branch wire |24 to a front contact |25 of a relay |29. The wind- 65 ing |21 of this relay is connected at one eruto `the contact |25 and at its other end by wire |28 to a front contact |29 of a time delay relay |30. "The other iront contact |3| of the time delay relay |30 is connected by a wire |32 to an- 70 other front contact |33 of the relay |28. The other front contact |34 of the relay |29, which cooperates with the front contact |33, is connected by a wire |35 to a switch |31 and by wire |39 tothe other line wire ||9. The other contact 75 of switch |31 is connected by a wire |38 to the front contact |29 of the time delay relay |30. The movable switch element |39 of switch |31 is urged continuously but yieldingly into open position and carries a roller |40 which is in a position to be operated to move element |39 into closed circuit position by a cam |4| on one of the dog bars 48 at approximately the time that the dog bar completes its movement in feeding a can into a position beneath the emptying conduit pipe |2.

One end of the winding of time delay relay |30 is connected by a wire |42 to front contact |43 which cooperates with the front contact |25 of the relay |26. The other `end. of the winding to a front contact |49 of the relay |26, and this contact |49 is also connected to the wire |36. The opposite and cooperating contact |50 of 'the relay |26 is connected by a wire |5| to the solenoid 94, and the other side of the solenoid is connected by a wire |52 and a resistance |53 in series therewith to the wire |42.

Where some liquids are emptied from cans, as in the milk industry, it is important to save the drip from the conduit |2 while it is elevated out of a can, and for this purpose a drip saving receptacle |54 (Figs. 1, 3 and 4) is mounted for movement into and out of a position immediately below the open lower end of the conduit pipe I2 when the latter is in elevated position above the can path. This receptacle is mounted on a tubular arm |55 which extends first laterally from the receptacle |54, and then at its free end extends downwardly and is slidingly received in a. sleeve |56. The sleeve |56 is rotatably mounted in a bearing |51 provided on one of the posts 2 of the frame. The arm |55 is provided with a collar |58 which rests upon the upper end of the sleeve |56 and limits the downward movement of the arm |55 in the sleeve, and a pin |59 carried by the upper end of the sleeve 56 is received in an aperture in the flange |58, so that while the arm |55 may be removed `from the sleeve |56 for cleansing by lifting it vertically therefrom, the arm and sleeve will normally rotate together when the arm is lowered into the sleeve |56.

A collar |60 may be removably mounted on the lower end of the sleeve |56 Vto hold the bearing sleeve down and against removal from the bearing |51 whenever the drip receptacle and its arm are lifted out of the sleeve |56. The sleeve |56 is provided with arms |6| and |62 (Fig. 3) extending laterally therefrom. A spring |63 connects' the arm |62 to a suitable part of theframe, and urges the arm |55 to swing in a direction to place the drip receptacle |54`immediately below the emptying conduit or pipe l2. Also mounted on one ofthe members of Ithe frame, such as a. post .2, is a guide |64 (Figs. 3, 6 and '1). This guide |64 has a slot |65 which extends generally in the direction of swinging movement of the arm |6| of the sleeve |56 of the drip having device. A link |66 is disposed immediately below the guide |64 and at its free end this link |66 carries a. pair of freely. rotatable, superposed' rollers |61 and |68 mounted on a common bearing pin. The upper roller |68 is disposed within the slot |65 of the guide |64, and a washer |69 is confined on the common bearing pin for the roller |68, such as by a screw |10.

The washer |69 is of greater diameter than the width of the slot |65, so that .it supports one end of the link |66 and guides the roller |68 along the slot |65. The lower roller |61 is disposed in the path of movement of the free end of the arm |6|. The other end of the link |66 is pivotally connected by a pin 1| to the upper end of a lever |12, which is pivoted at |13 to a post 2 of the frame. The lever |12 extends downwardly and at its lower end carries a laterally extending pin |14 that projects into the path of a lug |15 (Figs. 4, 8, 9 and 11) provided on one of the reciprocating dog bars 48. The lever |12 (as shown in Figs. 3 and 4) has its tw'o arms separated from one another and connected by a shaft at the pivot, the shaft part being rotatably mounted in a bearing |16 on a post 2 of the frame. A spring |12a urges lever |12 into the full line position shown in Fig. 4.

A latch |11 (Figs. 6 and 7) is pivoted at |18 so as to swing vertically and shift its latching nose into and out of the path of movement of the arm |6|,

and confine the arm |6| at one limit of its movement, which is shown by the full lines in Figs. 3, 6 and 7. The free end of the latch |11 is connected by a pivot pin |19 to one end of a link |80, the

other end of this link being pivotally connected a straight out position, so that just before the cross head 5 reaches its upper limit of travel, the lug abutment |83a will engage beneath the lever 8| and cam it upwardly suiiiclently to lift the link |80 and thus lift the latch |11 and release the arm |6|. Lug |83a then releases the lever |8| by camming it aside before the cross head 5 approximately reaches the upper limit of its travel, and drops back into straight out position. When the cross head descends, the abutment |83a will be cammed idly in an upward direction to clea the lever |8|. The operation of the embodiment of the invention shown in'Figs. 1 to 18 will now be described. with particular reference to Fig. 18 in which the connections are illustrated somewhat schematically and diagrammatically. Assuming that the emptying conduit |2 is in its elevated position above the cans (as shown in Fig. 1, for example) the cross head will be in its upper limit of movement (also shown in Fig. 18) and the drip saving receptacle |54 will be disposed beneath the lower end of the emptying conduit |2 (Fig. 1). Immediately after this, the cam 16 (Fig. 9) which is driven by the motor 80 will engage the roller 15 of the valve element 14 of valve 69, and force the valve element 14 into a position to connect the pipe 12 to the pipe 68. This will cause the delivery of a liquid under pressure from the pump 13 to the ram cylinder 63. This` liquid will force the rack piston 62 outwardly, vand the latter, which is confined in mesh with the gear 59 by the guide plate 62a, will rotate the gear 59 and thus shift the arm 60 from the position shown in full lines in Fig. 9 to the position shown in dotted lines in 9, that is, through a half revolution.

. to initiate another feeding movement of the cans.v

During this movement thearm 33, through the sliding bar 31 and the depending arm 55 of the dog bars, moves the dog bars from the full line position in Fig. 9 to the right to the extent shown was pulled to elevate the weight 91, and as soon as the high zone of cam 13 has cleared the roller 15, the pipe 93 is vented by connecting it to the pipe 13, whereupon the liquid which has been delivered to the cylinder ram 33 will escape back through the pipes 33 and 19 to the reservoir 1|. During this escape the weight 31 returns the rack 32 to its initial position, shown in full lines in Fig. 9, and in doing so will shift the dog' bars back to their initial positions shown in full lines Y in Figs. 8 and 9.

During the return movement of the dog bars,

the dogs/52 will ride under` the next successive cans until they clear vthe ca'ns and'then they will automatically move upwardly into driving positions for the next cans. As soon as the dog bars return to their initialpositions, to the left in Fig. 9, where they are slightly past the respective cans, they will remain there until the cam 13 again comes around and operates the valve 99 As the dog bars moved forwardly in feeding 18) on one of the dog bars engaged the roller |43 iust as the dog bars approximately comleted their can feeding movement, and rocked the switch lever |39 to close the switch |31. Duringy the same can feeding movement of the dog bars, the lug |19 thereon (Figs. 3 and il engaged and operated the cam 14 of lever |12 and thus rocked the.lever |12 in a direction to pull thevllnkv|93 to'the left in Figs. 6 and 7. This shifted the roller |91 against thearxn |9| so as to rock the sleeve |59 and the drip saver receptacle |54 from the dotted line position to the full line position in Fig. 3, and carry this receptacle vfrom beneath the conduit I2. The lug |15 completes this movement of lever |12 at approximately the limit of the can feeding movement by the dog bars. The cam '19 (as shown particularly in Fig. 9) has a dwell on its high zone, so that when it operates the valve 99` to cause a feeding movement of the cans it will keep thc valve9'9 open for a substantial interval of time, which is more than enough to complete a forward feeding movementof the cans. Just before the completion of that. feeding stroke, lug |15 will engage pin |14 and operate lever |12 and throughit and roller |31 will operate arm |3| from the dotted line to the full line position shown in Fig. 7 and thus the drip saving receptacle |34 is moved laterally out oia position beneath the emptying conduit, 4and latched atthe full line position of Fig. 3 by member' |11 until released by lug |33 on cross head 5.

The closing of the switch |31 will initiate a downward movement or lowering of the conduit i 2 in a manner which will be described presently, and this downward movement will start before the cam 19 has released the valve 99 and the dog bars have started their return stroke to any substantial extent. When the dog -bars return tn initial positions after the feeding operation of the cans, the lug |13 will release the lever |12 andthelatterwillthenbefreetoreturntothe full line position shown in Figs. 3 'and 4 under the action of the spring |12a. v

When the lug |4| on the dog bar operated th switch |31 into closed position 4at the end. o1 its forward stroke, or the can feeding movement oi the dog bars, as shown in Fig. 18, the switch |31 completeda circuit as fol1ows:fron the switch 32 and one of the main line wires vthrough branch wires |33 and |35, switch |31, wires |33 and |23, winding |21 of the relay |23, and wire |24 back to the other`line wire. This causes an operation of the relay 23 to the left in Fig. 18.'v

with resultant closing ofthe three pairs of front contacts. At this time the cross head 5 is in its elevated position, 'and therefore the normally closedl switch |45 is in closed position. A circuit wm therefore be immediately estabnsned from |25.and |43, wire |42, time delay relay |33, wire |44, switch |45, and wires |48 and |39 back to the other line wire. This energizes the tim'e delay |33,.with immediate closing of its front con- This time delay relay closes anther circuit (Fig. 18) as iollowsz-from branch wire |33, front contacts |33 and |34, wire |32, front con. tacts |29 and |3| of the time delay relay, wire |29, winding |21, and branch wire |24, thus making a holding ircuit f on'the winding |21 to hold it in vene condition eventhough the switch '|31 may be immediately broken, such as by the backward movement of the dog bars that carries the cam I4| out of operating engagement with the switch |31.v When the relay |29 was energized ity also completed another circuit as Vfollows:-,irom branch wire |39, front contacts |52, resistance |53, wire |42, front contacts |43 and |23 of relay |23 and wire,24 back to the other line wire. This causes an energizationpf the solenoid 94 and an operation ofi the valve element 93.

Before the energization of the solenoid 9 4, whichwas while the cross head 5 was in its elevated position, thevalve element 93 was in a position-nin which the pump 13 was delivering liquid through the pipes 9| and 31 to the lower end of the cylinder 9. This kept the cross head 5 in its elevated position. Upon operation of the valve element 93 following energization of the solenoid 94, the connection from the pump to the` pipe 9| will be broken and the pipe 9| will be vented to the exhaust pipe |01 leading to the reservoir 1|. Since there is always pressure from the pump on the upper end of the piston 9, when the liquid acting on the lower end of the cylinder 3 ,has been released, the pressure on the lower 'end of the piston 9 will fall, and the piston ,9 will be forced downwardly ata rate determined by the rate of escape of the liquid from the lower end oi' cylinder 3.

'Ihe liquid from the pump 13 will pass through the pipe 39, and then part of it will pass through the needle valve 33 into the pipe 99, and the remainder will pass through the check val/e passage 93 in the valve 95 to the pipe 39, and since vthis 'is a cheek valve passing liquid freely in the direction of the arrow (Fig. 18) the liquid' may passthrough the checkyalve to pipe A93 ,without material opposition.

stood that at this tine the cross head 5 is in its upper position, and the cam llihas caused a closingof the branch passage 91 of valve 95. .since the checa passagesi may open Healy,

one of the line wires to wire |24, front contacts It willr be underhowever, there is no material resistance to now from the pump to the upper end of cylinder 8. The liquid from the lower end of cylinder 8 will escape through pipe 8'I, and part of it will pass through the metering valve 90 to the pipe 9| and the remainder will pass through the valve |I. Since the check passage |02 opens freely only in the direction of the arrow (Fig. 18) the check in the passage |02 will remain closed, and the remainder of the escaping liquid will have to pass through the passage |03, but since the cross head with its cam |06 is now in its elevated position, free of the valve element |04, thcpassage |03 will be fully open and therefore rapid escape of the liquid from the cylinder 8 will be possible. This insures a rapid initial downward movement of the cross head 5 and consequently rapid lowering of the emptying conduit I2 towards the. container, but the engagement of the cam |06 with roller |05 causes operation of valve element |04 to slow down this descent, .as the conduit I2 enters the container, suilciently to prevent slopping o`ver of the milk or contents 0 1 the container;

When the sealing head or stopper 35 engages in the mouth of the container (as shown in Figs. 2 and 12, for example) the tapered, resilient gasket 36 will seal the connection to the mouth of the can or' container and hold the head 35 back against the action of the spring 31. As the cross head 5 continues to descend, it will lower the conduit I2 into the can until the fins 21 at its lower end rest upon the bottom of the can, whereupon the sleeves 26 and I4 will slide vertically on the conduit I2 slightly until the conduit I2 completes its descending movement. During this descent of the cross head 5, the movement will be rapid. until the lower end of conduit I2 nearly enters the liquid in the container, whereupon the cam |06 will engage the roller |05 of valve element |04 and will' restrict the passage |03 either fully or partially, and thus by cutting down the rate of the escape of the liquid from the cylinder 8 will retard the downward travel of the cross head. The retarding action may increase with the downward movement, because the cam I 06 may have successive portions causing increasingly greaterrestriction of the passage |03. Further and more accurate regulation ofthe descent of conduit I2 is also possible by varying the meter valve 80.

As the cross head 5 travels downwardly the switch |22 is closed by the cam |23 and remains closed until the sealing head or stopper 35 has engaged the can mouth, whereupon the cam |23 clears the switch 22 and releases it, which then opens automatically, it being a normally open switch. 'Ihis opens the circuit through the solenoid III and thus operates the valve |09. This will cut oi the tlow of compressed air from pipe I0 to tube 08, and vent the latter to atmosphere which causes a release of pressure on the diaphragm 20 in the air motor 2|. The spring 25 then operates the diaphragm 20 upwardly to seat the sleeve 29 against the deflector head 3| and -close Athe main passage through the conduit I2 to the spout I0. However, in the meantime the stopper 35 has engaged the mouth of the container, and continued descent of the conduit I2 carried the flange I3 away from the shoulder 38 and opened the passage from the chamber 40 into the can. Immediately, air under pressure from the pipe ||0 passes through pipe ||2, hose ||3 and tube 42 into the container or can, and exerts a pressure on the contentsv of the can.

Some of this pressure was immediately passed through the passage 44 into the tube 43, and thence by pipe 4 to the air motor ||5 of the micro-switch ||6, and the pressure in the motor ||5 caused the closing of the micro-switch ||6 which completes a shunt circuit and continues energization of the solenoid ||1 before cam |23 releases switch |22. This maintains valve |08 in its position which establishes the connection between pipe IIO, tube |08 and the air motor 2|, during which diaphragm 20 remains depressed and the sleeve or valveelement 29 lowered. Thus the sleeve 25| will remain in open position as the conduit I2 descends. Since the air pressure in the can is greater than in the conduit I2, the liquid or other contents in the can will be forced outwardly through the conduit I2 including the 'tube I5 into the collecting head II, and thence through the spout I0 into a suitable receptacle such as a weigh tank.

When the contents of the can have been forced out down to a level at the lower end of the sleeve I I4, the rush of air into the conduit I2 which then occurs will lower the air pressure in the container slightly, and this fall in pressure is transmitted through the passage 44, tube 43 and pipe I I4 to the air motor I I5, which is a very sensitive air motor. This fall in pressure in motor I I5 will cause an opening of the micro-switch ||6, with immediate deenergization ofthe solenoid II. Thereupon the valve |09 is operated lto cut oil communication between the pipe ||0 and tube |08, and to vent the tube |08 which releases the pressureon diaphragm 20. 'I'hereupon the spring elevates the diaphragm 20 and through it the tube I5 to seat the sleeve or valve element 29 against the deflector head, thus closing the main or larger passage through the pipe or conduit I2.

The-continuance of air pressure in the can or container, however, will vforce the small remaining liquid in the bottom of the can through the tube I5," up above the deilector. head 3|, and thence into the spout I 0, it being understood that during such movement, the air and contents of the container will be rushing through the small tube I5 together, which restricted outlet will raise momentarily the reduced pressure in the can or container 'and' cause a momentary `opening of valve sleeve 29. l

This produces a hunting movement of said valve sleeve `29 but the momentary opening of this sleeve 20 enables the air to force out whatever liquid may have been trapped in conduit I2 by the sudden initial closing of valve sleeve 29,

'and also any remaining liquid on the can bottom and in tube I5.

'I'hus one obtains a substantially complete emptying of the contents of the can. The rush of air beneath the sleeve 26 acts something like a'vacuum cleaner to carry off, by mechanical entrainment, practically all of the liquid collecting on the bottom of the can. This ow of air will continue until `the conduit I2 is again elevated in a manner which will nowbe described. The movement of air downwardly in the can as the emptying proceeds, apparently )aids in the draining of liquid from the side and bottom walls of the can towards the inlet tov pipe I5, with resulting lesser residuum in the can at the conclusion of the emptyingoperation.

When cross head 5 approximately reached its limit of downward movement, the hydraulic pressure on. the piston from' the variable delivery pump held it down, but at such completion of downward movement, the cam |4'I on the cross head 5 engaged the lever |46 of the normally closed switch |45, and cammed it into operi circuitposition which opened the circuit through wires |44 and I 48. Thiswas the circuit through thetime delay relay |30, and caused a deener- 'valve element 93 was operated to interrupt the exhaust connection between pipes 9| and |81 andA to connect the pipe 89 from the pump 'I3' again to the pipe 9|, so as to restore the same pressure per unit area to both sides of the piston 9.

Since the pressure area on the under side of the piston 9 is greater, the piston then begins to rise and elevate the cross head 5 and through it the emptying conduit I2. During this elevation of the cross head 5, the liquid from the pump 13 will pass through pipe 9| and then divide, part of it passing through the metering valve 98 and the remainder through the freely opening check valve in passage `92, andthence through pipe 81 through the bottom of the cylinder 8.

`The liquid 'in the upper end of the cylinder will have to escape through the pipe 86, and part of this will pass through the metering valve 88, and the remainder will attempt to pass the check valve in passage 96- ofl the valve 95, but the latter will immediately close and force such liquid to pass instead through the passage 91. Since the cross head 5 is lowered, the cam |88 will have released the valve element 98 and thus there will be a free ow of escaping liquid through passage 91 until the cross head 5 approximately reaches its upward limit of movement, whereupon' the cam will again close or restrict the passage 91 and slow down the upward movement to that permitted by the escape of liquid through the lmetering valve l88 and the passage 91. Thus, we

have an automatic slowing down of the cross head as it approaches its upward limit of move- As the cross head 5 is elevated, the flange I8 on the conduit I2 will again engage with the stopper 35v and lift the sealing head 86, from the mouth of the can. The cam |23 willvraise interponent lever I22a and pass idly thus avoiding operation of switch |22 on the upward stroke of the cross head. The engagement of the ange I3 with theunder face of the stopper 85, before. the stopper is lifted from the can, closes the passageI 4I and thus preventsI escape of the air through the pipe II2 and tube 42. The upward travel of the cross head 5, of course, released the switch |45 whereupon it automatically closed, but this did not occur until the relay winding |21 had been deenergized, and therefore the re'- c-losing of switch |45 did not cause any reenergizing cf-the time delay relay |38, due to the fact that the circuit of that relay |88 was now opened at the contacts |25 and |48 of the relay |26.

When the cross head 5 reaches its upward limit 'of movement, it is held in that position until the continued operation cf the motor 88 carries the cam 16 around into a position to engage roller 15 and start another forward or feeding movement of the cans, whereupon the cycle of operaf tion as above recited is repeated. However, just before the cross head 5 reached its upper limit of movement, its lug |83 engaged the lever |8I and through it lifted the link |80 and the latch |11, which released the arm I6| on the drip saving receptacle, whereupon the spring |63 shifted the receptacle |54 promptly into a position beneath the lower 'end of the emptying conduit I2 to collect any drip therefrom. The lever |12 had previously been returned by its spring |124 to the full line position shown in Fig. 4 ready for a new latching movement at the completion of the next feeding movement of the cans, whereupon'the receptacle |54 will again be shifted from beneath the emptying conduit I2 just as the latter is about to be lowered.

Where the emptying device is used for removing milk from cans, for example, it is important that all parts exposed to milk be accessible for cleaning at the conclusion of each day's operation, or at suitable intervals. It is therefore important that access be had to the interior of the collecting head I| for the cleaning of all the surfaces therein which are exposed to the milk or other liquid being removed from the cans. Accordingly, the air motor 2| is supported on a frame |84 which is provided on the cover I6, and the cover, as explained hereinabove, is removably coniined to the collector head I|. A suitable gasket is interposed between the cover I6 and the head II (Figs. 12 and 15). The diametrically opposite sides oi' the head II are provided with external bosses |85 (Figs. 12, 13 and 15) which have slots |86 extending upwardly into the same from the lower edges thereof. A clamping bail |81 is provided with hinge pins |88 which are received in the slots |86, and the bail |81, after its pins |88 have been engaged in the slots |86, may be swung on pins |88 to a position over the air motor 2|.

A screw |89 is threaded through the cross pa vof the bail |81, so as to engage against a cap 2| a normally closing and sealing an opening 2| b in the cover of the air motor 2| and clamp it and,

through it, the motor 2 I, the flange |84 and cover lI6 removably to the upper face of the collecting head II. The tightening of the screw |89 will draw the pins |88 upwardly in the slots |86 and thus prevent their'removal from the bosses |85. When it is desired to disassemble Vthe emptying head -in order'to cleanse it, the screw |89 is loosened, and then the bail |81 is swung laterally teclear the air motor 2|, whereupon the bail |81 may bedropped to carry its pins |88 out of the slots |86. The air motor 2| with frame |84,lv

y cover I8, deector 8|, valve 29 and tube I5 mayinstead of using hydraulic means for feeding the cans beneath the emptying conduit in a step by step manner, and for lowering and elevating the cross head, I have utilized cams driven by a synchronousv or constant speed motor. In this embodiment of the invention, parts corresponding to those in Figs. l to 18 have been designated by similar reference characters, and will not again be described except where necesary to explain the relationship to other modied parts of the apparatus. 

